LEILA-Y Ø21.6mm LED Lenses Ledil LEILA-Y Ø21.6mm LED Lenses are ideal for general, wall-wash, and sports lighting. The LEILA-Y Lenses are offered with symmetric and asymmetric beams. LEILA-Y Lenses feature a thin holder design and are backward compatible with previous LEILA generations. The wall-washing beam is designed to be used in groups to provide uniform illumination with a typical installation distance from the wall of 10cm to 20cm and an optimal luminaire spacing of 5cm to 15cm.